Volontari.at is an open source Crowdsourcing platform based on Rails and Ruby gem voluntary.
Current voluntary plugins are text creation, translation, scholarship, classified advertisement, ranking and music metadata enrichment.

Ranking plugin for crowdsourcing management system gem Voluntary.Software about a mashup of abandoned GetAmen.com and Versus.com.
Screencast of first version deployed on production: https://www.youtube.com/watch?v=VfqQe-_OWmU

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Coding Amigos is a community of Entrepreneurial Developers with Activist Streak. It is made for people who like what they do and are good at it.